At this stage, the performance of digital devices is changing rapidly, but the rope around the neck is the battery.

The noble kidney machine also has a nightmare of three charges one day, and the urine bag-like power bank used to be a necessary equipment for many people to carry with them.

After flying for about half an hour, before the elves were fully satisfied, Nahbet's battery was already only a quarter of his power, which was close to dangerous power.

After he gave the order, Nahbet began to return automatically, landing almost exactly where it had taken off, and the rotors quickly stopped turning.

The elves looked at it again with no contempt or suspicion in their eyes, but full of envy and amazement.

Due to the high requirements of Weikang, it is necessary to ensure that the drone hovers overhead at all times during field investigations, so it is very luxurious to be equipped with several sets of spare batteries for rotation, anyway, this is the funding provided by Binhai University, and this requirement is very reasonable and not excessive.

Zhang Zi'an replaced Nahebet with a spare battery, worried that its internal parts would overheat due to continuous flight, and waited for a while, but in fact, it was only slightly warm.

Using this time, he pulled out another device that attracted the elves' attention.

"What is this?" they asked. With the experience just now, they don't dare to underestimate these unremarkable technological products.

"This is an infrared trigger camera that I asked Professor Wei Kang for. Zhang Zi'an explained: "It is said that this thing can automatically take pictures, and once a warm-blooded animal or moving object passes in front of the camera, it will automatically press the shutter and take a picture." ”

Although this thing is rare, it does not arouse the interest of elves like drones - it is nothing more than taking pictures, what is the difference between being photographed by a human and being automatically photographed by a camera?

Zhang Zi'an patiently clarified his thoughts.

When he saw the infrared camera in Weikang's office, he immediately became worried - could this thing work on the invisible elves?

After learning about the principle of infrared cameras from Weikang, he was even more worried, because infrared cameras are designed to be able to wait for a long time in the field day and night, regardless of day or night.

So, if an invisible elf passes in front of the camera and triggers the camera's sensor, causing the camera to take pictures automatically, will it photograph the elf?

Even if it can't be photographed, it will make the expedition team think that a supernatural event has occurred, causing panic.

As for saying that the camera is broken, this is unrealistic, because the scientific expedition team brought a lot of cameras of the same type, and they can't be broken at the same time, right?

So, he borrowed an infrared camera with a dead face, intending to try it out in advance, just in case.

Only then did the elves understand his intentions.

Lao Cha volunteered to let Zhang Zi'an make it invisible, and then walked in front of the infrared camera in a stealth state, walking back and forth several times at different speeds.

Zhang Zi'an took out the memory card of the infrared camera and inserted it into the mobile phone to read it.

Fortunately, the memory card is blank, which means that the camera's sensor did not detect the invisible elf, which is why the heart is put back in the stomach.

His concerns are polarized by the elves, with Lao Cha praising him for being thoughtful, and Snow Lion scolding his mother-in-law for being suspicious......

Putting the infrared camera away, he touched Nahbet's case, it was already cold, and he was ready to start the second round of testing.

The first round was a simple test of flight status, but this time he switched to a new test method, switching to follow mode, and having Nahbet keep himself as the target and hover above his head, which is a simulation of the situation during a field trip.

"Xinghai, are you ready to be defeated by me, now it's time to end your long-term winning record!"

Everything was ready, and he confidently challenged Xinghai to hide and seek, and he was not ashamed of himself.

"Meow woo~ I'm ready!"

Xinghai was already eager to try, and couldn't wait to try the few hiding places that he had just seen from the sky.

"Alright, I'm going to start counting - this time with my eyes closed!1, 2, 3......"

He closed his eyes widely, and made no secret of what he had done when he was peeking while counting.

"Meow ~ Lai Pi! Count too fast!"

Xinghai couldn't stop complaining, and his voice became erratic, almost instantly from near to far.

After tossing for more than half an hour, the elves who got up early were a little hungry, Fina just saw through the drone that Uncle Li had delivered breakfast to the pet store, and hurried back to the store to eat, of course, the snow lion followed suit; Lao Cha and Fei Ma liked to eat hot food, so they also went back to eat first; the stray cats returned to the green area one after another, and Vladimir got some freshly baked news and intelligence, and had something to deal with, so he left temporarily.

Richard didn't go, it didn't need to eat hot cooked food anyway, and here it was free to defecate and defecate anywhere.

"98, 99, 100! I'm going to start looking for you!" Zhang Zi'an quickly counted the 100 numbers and opened his eyes.

He gave Richard a look to the onlookers, meaning to ask where Xinghai had run away, but only got Richard a roll of his eyes.

"Quack! You idiot! Think that having a drone is omnipotent? Anyway, in the eyes of Uncle Ben, drones are not as good as unmanned chickens!"

Zhang Zi'an didn't expect it anyway, through the screen of the remote control, he reversed the video of the time he counted just now and watched it, this was already blatant cheating.

However, Xinghai's actions were too fast, staying in place in the first second, turning around in the second second, and disappearing in the third.

Exo_me？

It seems that Xinghai has finally become serious for the first time in a long time.

Zhang Zi'an didn't admit defeat so quickly, and he began to play the video frame by frame.

The drone is equipped with a gimbal camera that can record 4K video at 60 frames per second, which means that 60 moments can be recorded with a snap of the fingers.

It's a pity that he watched all 60 frames of the picture, but still didn't see the process of the disappearance of the sea of stars.

It was there at frame 30, and it was gone at frame 31.

It seems that it is time to give feedback to the manufacturers and let them offer lower definition but higher frame rate recording modes, such as 1080P/960 fps?

But he doubted in his heart, even if it was raised to 9600 frames, would he be able to capture Xinghai's actions?

He circled the green space twice, startled countless insects, and ended up with pine needles all over his face, but found nothing, and finally had to admit defeat, because the clerks had already begun to work, and he could not continue to waste time here.

"Forget it, Xinghai, I'm not very prepared this time, I'll give you a game!"

He doesn't lose when he loses, and he still has a hard mouth.

"Meow ~ Win!"

The sea of stars suddenly came out of nowhere, cheering for victory.